Canon Kabushiki Kaisha

Tokyo Shibaura Denki Kabushiki Kaisha

Sadahiko Tsuji

Yasuhisa Sato

Sadatoshi Takahashi

Kazuo Tanaka

Masatake Kato

Kazuo Fujibayashi

Shigeru Ogino

Muneharu Sugiura

Akira Tajima

Toshiaki Asano

Tsunefumi Tanaka

Kazuo Ishikawa

Takeshi Akiyama

Masayoshi Sekine

Norihiro Nanba

Kazuhiro Noguchi

Shigeyuki Suda

Masamichi Toyama

Hiroyuki Hamano

Junichi Murakami

Noritsugu Hirata

Katsumi Tanaka

Jun Tokumitsu

Hiroyuki Takahara

Hirokazu Mogi

Yujiro Agari

Tokuichi Tsunekawa

Takashi Kobayashi

Hidetoshi Suzuki

Hideaki Mitsutake

Nobuhiko Shinoda

Katsumi Kurematsu

Hideo Yokota

Naoya Kaneda

Susumu Matsumura

Kazumi Kimura

Nobuhiro Takeda

Makoto Sekita

Hideki Morishima

Nozomu Kitagishi

Noritaka Mochizuki

Hiroshi Saruwatari

Setsuo Minami

Kenichi Kimura

Toshikazu Yanai

Yoshihiro Honma

Jun Hattori

Nobuo Minoura

Keisuke Araki

Shigeo Ogura

Yasuyuki Yamazaki

Masato Kosugi

Shigeru Kawasaki

Youichi Iwasaki

Kenichi Shinbori

Tomoshi Takigawa

Hidekazu Okajima

Masashi Hori

Junko Shingaki

Hiroyoshi Inaba

Keiichi Sakaguchi

Michiharu Aratani

Sigeru Oshima

An optical element includes an incidence surface, one or more reflecting surfaces reflecting light from the incident surface, an emergence surface, and off-axial curved surfaces causing the light to emerge from the emergence surface. At least one of the incidence surface, the emergence surface and the one or more reflecting surfaces is a surface having diffracting action. The surface having the diffracting action is a curved surface.

Optical element and optical system having the same

The present invention relates to an image displaying apparatus comprising an image displaying device for radiating light to display an image, a first optical system for forming the image on a primary image plane, which has a magnification-changing portion for changing an image magnification of the image and a second optical system for guiding light from the primary image plane to the pupil of an observer in order to enable the observer to observe an enlarged, virtual image of the image formed on the primary image plane.

Image displaying apparatus having magnification-changing system

There is disclosed an image taking apparatus comprising a first optical unit for forming an image, a second optical unit positioned on the optical axis of the first optical unit, a third optical unit positioned behind the second optical unit and having plural lens units for re-focusing parts of the image of the first optical unit, converters for converting the plural images, formed by the third optical unit, into electrical signals, and a processor for processing the electrical signals from the converters in order to obtain an image of a high definition.

Image taking apparatus

An optical apparatus is provided with a lens unit movable in the direction of the optical axis thereof, a lens barrel, an electromagnetic coil coupled to one of the lens unit and the lens barrel, a driving unit having a magnetic material coupled to the other of the lens unit and the lens barrel, and a guide for slidably guiding the lens unit relative to the lens barrel.

Optical apparatus provided with a driving unit for moving a lens

This specification discloses a polarization converting apparatus having means emitting non-polarized light, and polarizing means having a light incidence surface and a light emergence surface, the polarizing means receiving the non-polarized light by the light incidence surface and causing polarized light to emerge from the light emergence surface, the size and shape of the light incidence surface being similar to the size and cross-sectional shape of the non-polarized light. The specification also discloses an optical instrument having such apparatus.

Polarization converting apparatus and optical instrument having the same

This specification discloses an optical apparatus provided with a lens unit movable in the direction of the optical axis thereof, a lens barrel, an electromagnetic coil coupled to one of the lens unit and the lens barrel, a driving unit having a magnetic material coupled to the other of the lens unit and the lens barrel, and a guide for slidably guiding the lens unit relative to the lens barrel.

An image stabilization apparatus of an inertial pendulum type corrects vibration of an image by a correcting optical device relatively displaceable with respect to a barrel. The apparatus includes a restriction device for generating an operational effect which changes according to a position of the correcting optical device for restricting the relative displacement of the correcting optical device, and a controller for changing the effect of the restriction device in accordance with a focal length or a direction of displacement of the correcting optical device.

Image stabilizing apparatus

An active, external distance measurement type apparatus for focus adjustment of a photographic lens comprises a light emitting element arranged outside a light beam passing through the photographic lens, a projection lens for projecting light from the light emitting element to an object field, a collection lens arranged in spaced relation to the projection lens by a base line length, and a photosensitive element to which the irregular reflection of the light rays projected by the projection lens onto an object to be phtotgraphed is directed by the collection lens. An optical unit is arranged to refract a portion of each of a projecting light beam and a receiving light beam in a different direction so that parallax is compensated for.

Active external distance measuring system having an optical device in

A zoom lens comprising a front lens group including a lens unit for decentering relative to an optical axis to stabilize an image at the focal plane and a rear lens group including lens units movable along the optical axis for zooming on the image side of the front lens group.

Image stabilization lens system

An image-stabilized optical device comprising, from front to rear, a first lens group of negative power, a second lens group of positive power and a rear lens group of positive power for forming an image, wherein the second lens group rotates around a point which is on the optical axis away from its rear principal point rearward by a distance of about .beta.2.multidot.f1/(1-.beta.2) where .beta.2 is the image magnification of the second lens group and f1 is the focal length of the first lens group, and lies within the rear lens group, whereby the image is stabilized against accidental vibrations.

Image-stabilizing optical device

A focus detecting device and a photographic apparatus provided with such a device has an apparatus for setting optic axes thereof with a base length therebetween, and for photoelectrically detecting a focus state thereof, at least one of the optic axes being bent, or reflected, by a fixed reflecting surface, and a focus detection component disposed along the bent optic axis and movable, during a focus detection operation, in a direction intersecting the bent axis.

Focus detecting device and photographing apparatus provided with the same

A zoom lens comprising, from front to rear, a first lens unit of negative power and a second lens unit of positive power, both lens being axially moved to effect zooming, in which a diaphragm is arranged between the first and second lens units to remain stationary during zooming.

Zoom lens having built-in diaphragm

A front conversion lens is disclosed comprising, from front to rear, a first lens unit made of glass material, a second lens unit made of plastic material, and a third lens unit made of glass material.

Conversion lens

A compact zoom lens comprising, from front to rear, a first lens unit of positive power for focusing, a second lens unit of negative power axially movable in one direction when zooming from one end of a range of image magnification to the other, a third lens unit of positive power axially movable in a path convex toward the rear to maintain the constant position of an image surface which shifts with zooming, and a fourth lens unit of positive power for forming an image which remains stationary during zooming, wherein a fixed diaphragm is arranged in a space between the second and third lens units.

Compact zoom lens

To minimize the size of a front conversion lens, an aperture stop is arranged on the object side of a master lens, and the front conversion lens is made releasably attachable.

Photographic system having front conversion lens

Growing community of inventors

Yokohama, Japan

Sadahiko Tsuji